<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
    />
    <meta
      name="description"
      content="Clamp a model to a 3D Tileset using the clampToHeight function."
    />
    <meta name="cesium-sandcastle-labels" content="Showcases, 3D Tiles" />
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script
      type="text/javascript"
      src="../../../Build/CesiumUnminified/Cesium.js"
      nomodule
    ></script>
    <script type="module" src="../load-cesium-es6.js"></script>
  </head>
  <body
    class="sandcastle-loading"
    data-sandcastle-bucket="bucket-requirejs.html"
  >
    <style>
      @import url(../templates/bucket.css);
    </style>
    <div id="cesiumContainer" class="fullSize"></div>
    <div id="loadingOverlay"><h1>Loading...</h1></div>
    <div id="toolbar"></div>
    <script id="cesium_sandcastle_script">
      function startup(Cesium) {
        "use strict";
        //Sandcastle_Begin
        var viewer = new Cesium.Viewer("cesiumContainer", {
          terrainProvider: Cesium.createWorldTerrain(),
        });
        var scene = viewer.scene;
        var clock = viewer.clock;

        var entity;
        var positionProperty;
        var dataSourcePromise = Cesium.CzmlDataSource.load(
          "../../SampleData/ClampToGround.czml"
        );
        viewer.dataSources.add(dataSourcePromise).then(function (dataSource) {
          entity = dataSource.entities.getById("CesiumMilkTruck");
          positionProperty = entity.position;
        });

        var tileset = scene.primitives.add(
          new Cesium.Cesium3DTileset({
            url: Cesium.IonResource.fromAssetId(40866),
          })
        );

        viewer.camera.setView({
          destination: new Cesium.Cartesian3(
            1216403.8845586285,
            -4736357.493351395,
            4081299.715698949
          ),
          orientation: new Cesium.HeadingPitchRoll(
            4.2892217081808806,
            -0.4799070147502502,
            6.279789177843313
          ),
          endTransform: Cesium.Matrix4.IDENTITY,
        });

        if (scene.clampToHeightSupported) {
          tileset.initialTilesLoaded.addEventListener(start);
        } else {
          window.alert("This browser does not support clampToHeight.");
        }

        function start() {
          clock.shouldAnimate = true;
          var objectsToExclude = [entity];
          scene.postRender.addEventListener(function () {
            var position = positionProperty.getValue(clock.currentTime);
            entity.position = scene.clampToHeight(position, objectsToExclude);
          });
        }
        //Sandcastle_End
        Sandcastle.finishedLoading();
      }
      if (typeof Cesium !== "undefined") {
        window.startupCalled = true;
        startup(Cesium);
      }
    </script>
  </body>
</html>
